Gas heater



May 26, 1925.

' J. H. GRAYSON GAS HEATER Patented Mayas, 1925.

UNITED STATES vPATENT OFFICE. A'

JOHN H. GRAYsoN, oF ATHENS, oHro, AssIGNoR To THE J. H. GHAYsoN MANUFAC- TUBING COMIEANY, `OF ATHENS,

OHIO, A CORPORATION OF OHIO. 4

GAS HEATER.

Application filed March 11, 1924. Serial No. 698,552.

To all whom it may concern:

Be it known that I, JOHN H. GrRAYsoN;l a citizen of the United States, residing at Athens, in the county of Athens and State of Ohio, have invented certain new and use-v ful Improvements in Gas Heaters, of which the following is a specification.

This invention relates to gas heaters of the glower type and particularly to a heater which will insure a complete combustion of the gaseous fuel.

While gas heaters of the glower type are sometimes arranged to discharge the products of combustion through a flue or chimney, the heaters are more often used without iiues and the products of combustion are discharged into the room. As the. B. T.`U. standard of the gas. either manufactured vor natural, may vary over a considerable range, carbon monoxide may pass into the room` due to an increase in the B. T. U. standard after the burner nozzle has been adjusted for satisfactory operation at a given B. T. U. content. As gas manufacturers increase the B. T. U. standard of their product at certain times vof the year without notice to the public, some of the reported fatalities from asphyxiation have undoubtedly arisen from the failure of poor radiant heaters to effect complete combustion when the B. T. U. standard of thegas varied.

An object of the invention is to provide a fiueless gas heater of the glower type which will be fiexible in operation, i. e. it will insure complete combustion, although the B. T. U. standard of the supplied gas varies over a wide range. A. further object of the invention is to provide a gas heater of the glower type which will insure a surplus of air over that necessary to effect complete combustion. A further object of the invention is to provide a gas heater of the glower type in which secondary air is supplied in such quantity as to insure perfect combustion even though the burner nozzle is improperly adjusted for the gas supply.

An embodiment of my invention which will attain these objects is illustrated in the accompanying drawings, in which- Fi 1 is anelevation, partly in section, of a ack brick, burner andglowers, and

Fig. 2 is a broken section on line 2-2 of Fig. 1 and with portions of the heater frame also shown.

In the drawings, the numeral 1 indicates the back,brick which is mounted u on a A plate 2, from which the burner mani old 3 is suspended. The burner manifold in turn acts as a support for the gas manifold 4, which is provided with nozzles 5 located below the tubes 6 of the burner manifold. A

The glowers are provided with terminal lugs 7 which engage behind a depending flange 8 at the upper and outer edge of the fire4 brick 1` and the bottom ends of the glowers are held in place by projections 9 on the plate 2. The rear faces of the glowers are preferablyvslotted as at 10 and are provided with openings 11 which align with passages 12 extending through the fire brick.

The passages 12 connect with recesses 13` which extend to the top of theV fire brick and other passages 14 extend from the recess 13 at the level of the flange 7, leaving narrow reinforcing strips 15 between the passages 12 and 14. The strips 15 are preferably triangular, as shown. to permit the ready flow ofthe hot products of combustion through the rear of the fire brick. The back 16 is spaced from the rear of the fire brick and doesnot extend to the ornamental front 17` thus providing a space for the discharge of the hot gases into the room.

The rear portion ofthe plate 2 is provided with openings 18 in line with recesses or grooves 19 formed in 'the lower edge of the fire brick 1, and the face of the fire brick is provided with projections20, which are preferably staggered and cupped, as described in my prior Patent No. 1,371,477.'

The operation of the burner is as follows The nozzles 5 are preferably designed to secure the entrainment of sufcient primary air, as indicated by arrows a, to provide the necessary ratio for complete combustion. Secondary airl passes into the base of the glowers, since the burner manifold 3 is suspended below the plate 2, and a further supply of secondary air enters the front of the glowers, due to suction set up by the` rearward discharge of the hot gases through the openings 11 and passages 12, 13, these two currents of secondary air being indicated b the arrows b, c, respectively. An additional supply of secondary air mixes the hot gases as they pass through the openings 11, this supply comprising air which passes upwardly over the hot rojecoverthe tire brick 1j is highly heated and will'v readily combine with any unburned fuel which reaches the fpass'age'12,s`ice the fuel is alsohighly heated.v Exceptunden nei'ceptional conditions, -howeyenjthe secondary air which pa'ssesoverf'the re brick will'not be needed to complete combustion,

in view of they secondary air 'which enters erably such that sufficient primary air enters the burner manifold to insure complete combustion of the gas normally supplied at a given locality, in which case each separate supply of secondary-airadds a factor `of safety insuring complete combustion when the B. T. U. standard is increased. `Obvi ously, the nozzle opening may be such that some of the secondary air entering-at the base o`f the glowers is needed to establish the normal ratio for complete combustion.

Such ractice, however, results in a lowering og) the factor of safety and should be avoided, since it is possible, by careful design, to secure suiiicient primary air at the base of the lburner tubes to form the air- `gas ratio-required for the normal gas.

. rear wall at the top thereof, a'

as they leave said glower and in such quanof said fire-brick, whereby secondary air The invention is not limited to the specie embodiment herein described but contemplates any arrangement of a lueless heater of the glower type in which the supply-0f secondary air mixes with the hot gases before they escape from the highly heated portions of the heater. -It will be apparent that many changes whichmay be made in the various parts, their relative size shape and location fall within the scope. o my invention, as 'set out in the following claims. e

I claim 1. In a' flueless heater of the glower type, a glowerfa {ire-brick -having a passage through "which -hot gases pass from said glower beforeleaving the heater, and means for supplying secondary air to the hot gases tity as to insure complete combustion.

2. In a iiueless heater of the glower type, a firebrick, a glower in front of saidlire brick and having an' opening through its passage through the irebrick in alignment with said opening, means cooperating with said opening. and passage to permit the escape 4of products of combustion into the room Ifrom the rear vof the heater, and means for supplying secondary air at the entrance into said passage.

3. In a iueless heater of the glower type, a

' jeetions on sai casing having a back wall and a top, the

upper edge of'said back wall being .spaced from said top,.a glower havingan opening 'through its rear wall at the top thereof, a' lfire-brick spaced from said back wall and having a passage therethrough in all ment with the opening insaid glower, whereby the products of combustion may pass through said fire-brick and escape into 1 the room through the space between' the rear wall and top of said casing, andineans for supplying secondary air to the products of com-l bustion as they leave'said glower.

4. The invention as claimed in claim 3, wherein sald means comprises grooves in the base of said fire-brick for admitting air be# tween said fire-brick and said glower.

5. In a lueless heater of the glower type, a casing having a backwall and a top, the upper edge of said back wall being spaced Y from said top, a fire-brick spaced from said through said fire-brick 4in alignment with said opening, a recess on the rear face of said fire-brick extending from said passage to the top of said fire-brick and means at the base of said fire-brick for admitting air between said lire-brick andsaid glower.

7.' In a flueless heater of the glower type, a fire-brick having a flange depending from itsupper edge and having projections on its front face, a glower having an opening.

through its rear wall atthe topvthereof, -a plate ,for supporting said lire-brick, ro-

of said glower, a passage through said firebrick in alignment with the opening in said glower, an opening in said plate Aand under said fire-brick and a passage in said'iebrick establishing communication between the opening in said plate and the front face may pass over the face of said fire-brick to said glower.

8. In a flueless heater of the glower type,`

.110 plate for receiving the ase a supporting plate, a fire-brick and a glower mounted on said plate, a burner carried by said plate and with its outlet spaced from said plate, an opening in the rear wall of said glower and a passage through said firebrick whereby the productsfof combustion are discharged from the rear of the heater, and passages in said plate and the base of said tire-brick for admitting air to the front to the top wall of the fire-brick, and grooves face of said glower. in said fire-brick at the base thereof, said 9. A fire-brick for use in a fiueless heater grooves extending` from the front to the botof the glower type, said fire-brick having a tom wall of said fire-brick.

front face provided with projections, a pas- In testimony whereof, I aix'my signasage extending through said fire-brick near ture.

the top thereof` a recess on the rear face of said fire-brick extending from said passage JOHN H. GRAYSON. 

